George richardson



IMPROVEMENT-IN LET-OFF FOB. LOOMS.

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TO ALL WlIOM IT MAY CONCERN:

Be it known that I, GEORGE RICHARDSON, f Lowell, county of Middlesex, and State of Massachusetts, have invented new and useful improvements in Let-Oli` Motion for Looms; and I dovhereby declare that the 4following is a full and exact description thereof, reference being had to the accompanying drawings, and letters of reference marked thereon.

The nature of my invention consists in providinga loom with friction-pulley, gears, friction-'lever with receptioinarm and pad, and a whip-roll finger, arranged and combined in a peculiar manner, substantially as herein specified, all for the purpose of giving a more perfect and positive' let-off to the yarn or warp from the beam, which will enable the manufacturer to weave or make a more perfect fabric or cloth.

To enable others skilled in the art to make and use my in vention, Twill proceed to describe its construction and operation.

Figure 1 represents a pian of a loom w'ith my improvementsattached.

Figure 2 re'presentsa. side elevation of the same.

Figure 3 represents an end elevation.

a represents the loom sides; I; b the warp shades; c the warp; d the whip-roll; e the whip-roll finger; f

the friction-lever; g the friction-pulley; rthe tension-spring; j the yarn-beam; c the yarn-beam gearf Z the pinion; m the friction-pad; n the breast-beam; o the arm projecting from friction-lever; p the adjustable brake; the pawl` or cam.

Hitherto manufacturers have experienced great diihcu'lty in weaving cloths or fabrics, arising Irom imperfect letting-off of the warps from the beam. `In order to weave perfect, even cloth, every thread of Woof must be wove into the warp,`the exact and same distance one from another, or a given, fixed number of threads for every inch in length of cloth in the entire web. The number of threads to the inch having been first determined, and all other things being equal, this object is attained. The positive motion of the reed or sley, secured in the lathe, actingagainst the Woof throws or beats forward a thread of Woof, and leaves it at every stroke precisely the same distance parallel to and from the centre of the crank. Thus it follows that if every thread of woof laid in the warps be of the same size, and is beatvup with equal force by the reed, the strain on the warps will be equal, and each motion of the ley will require an equal quantity of warp t0 be let off. And further, this let-off or relief from the yarnbeam, to produce the desired result, should occur as near as possible at the moment when the shades or sheds are farthest extended for the reception of the shuttle with its Woof, and when the reed is the farthest back from the cloth. And, again, it is equally as important and necessary that this relief or let-off should cease, and the yarn-beam be firmly held or stopped by the brake when the reed strikes the cloth.

I 'I have, as I believe, produced these beneficial results as follows: The yarn-beam j is illed with yarn for the warp of the clot-h; the yarn is then drawn over the whip-roll d and breast-beam n, and Secured to the cloth beam, having previously been drawn through harness and reed or sley, the reed having been ladjusted and secured in the lathe, 'the harness strapped and hung. The weaver with Woof in shuttle, by aid of power, passes. it through the shades b b. This thread of Woof, which has been left by the shuttle, is then instantly beat up or thrown forward by the reed to its full extent. This thread of Woof beat up in the Warp, in connection with the extension of the shades b or shedding motion, produced by suitaole harness-operating mechanism, causes corresponding additional tension to the warp c, which acts on the whip-roll d, operating the whip-roll fingere, which instantly acts upon the projecting-arm o of the lever f in this manner, at' the same instant raising the friction-pad m from the friction-pulley g, thus allowing the yarn to turn the yarn-beam in the direction of the arrow until suiiieient warp is let o'. This gives the required relief, equivalent to the last thread thrown 'crossing'and the extension of the warp e. The warp having been let 'oi suiflciently the whip-roll d rises and allows the friction-pad m to resume its former seat on the friction-pulley g, where itis held by aid of the tension-spring L acting-on the end of the lever The tappet g is operated in such manner that it strikes the projection of the adjustable stand 1J on the friction-lever flat the time the sley is beating up the weft, and forces the lever in contact with the friction-pulley g and prevents any letting off of warp. It is apparent that should the lathe continue its usual motion, and no weft he thrown in the shed of the Warps, the let-olf will stop and be entirely at rest, as no action would be communicated to the friction-lever f without the thread of Woof or filling is passed through the shades I) b and receives its required stroke.

What I claim as my invention, and desire to secure by Letters Patent, is

1. I cla-im the combination and arrangement of the whip-roll 0l with its nger e, the leverf, tension-spring ,`1iction-pa.d m, and friction-pulley y, of any form or shape, substantially as and for the purpose herein set forth. v

2. I claim the cam or puwl q in combination with the adjustable stand p r and friction-brake f, as end fo the purpose herein described.

8. I claim allowing the let-oil` at the time of the extension of the sheds of the warp by its action on the whip-roll, and completely stopping the let-olf at the time of bea-ting up the Woof by means independent ofl the Whip-roll, substantially ais herein specied.

'GEORGE RICHARDSON. Witnesses:

ABIEL PEvnY, GEO. E. PEVEY. v 

